1 Add about 10 mL of 1 M HNO3 from the dispenser
2 Add 4.0 mL of standard Cu2+ solution and 6.0 mL of 1 M HNO3 from
the dispensing buret. Mix well.
3 Add 7.0 mL of standard Cu2+ solution and 3.0 mL of 1 M HNO3 from
the dispensing buret. Mix well.
4 Add about 10 mL of standard Cu2+ solution.
5 Weigh to the nearest milligram 0.2 g of unknown and add exactly
10.0 mL of 1 M HNO3. Mix well.
6 Weigh to the nearest milligram 0.3 g of unknown and add exactly
10.0 mL of 1 M HNO3. Mix well.
TABLE Preparing Calibration Standards and Samples of Unknown for
Spectrophotometric Analysis